I have a question regarding my webiste: goo.gl/OdQ4M
The page was launched in September 2012 and content was added since January 2013.
Until the 10th of March 2013 everything worked out well and visits increased.
Afterwards the stats went to zero and currenty not a single visitor comes from google.

We had some issues with internal ducplicate content but this was already solved. We have also worked a lot on link building and we post content every week.

Some of our pages are not indexed I thin because of low content - I am talking about pages like goo.gl/khlpJ but we still don´t know how we should handle this pages, because the content is what it is - only the odds of the sport events. How can we manage that google adds them to the index?

We think that our site is good and the content is of high quality so we absolutly do not understand why there is absolutly no traffic from google.
Btw: the page is in the index but the ranking is very bad and some pages are not in the index and some of them were deindexed as well.
In total we have more than 3000 pages but we excluded them from the sitemap so that we can start from a new basis.

As you said there was traffic before and now you have lost it, sounds like your website is penalized.
You said you have worked a lot on link building, it might be possible that you have been penalized by Penguin.

Login to your webmaster account and check for any warnings, if you find any then analyze your backlink profile and remove low quality/bad links coming to your website using disavow tool.
Once done submit your site for reconsideration.

Hey! I am Shobhit, working as Asst. Manager Online Marketing in New Delhi, India.
I am an avid and omnivorous reader as far as SEO and smartphones are concerned. I also have a blog on Search Engine Optimization that shares a few tips and tricks on SEO.

Thank you for your suggestion but we only created quality links without any tools or paid links. there is also no info in our webmaster tools. We simply have no idea what we can do to increase the traffic or at least get some traffic. as mentioned it is back to zero!
There is a lot of content, good design, some good links, no spam, no duplicate content but no visits.